Download IMSA Traffic Signal Technician 2 Exam Questions and Answers.pdf and more Exams Nursing in PDF only on Docsity!
IMSA Traffic Signal Technician 2 Exam
Questions and Answers
Question 1
In a TS2 cabinet, how many times can the MMU experience a "Port 1 Fail" in a 24 hour period before the fault is latched?
Correct Answer
1
Question 2
On a 2070 MMU monitor unit, how does the field tech program allowable phases?
Correct Answer
Remove diode on program card for allowable phases
Question 3
On an MMU, is it possible to tape the reset button to prevent the traffic signal from going into flash?
Correct Answer
Yes, it by-passes the conflict feature and will not flash
Question 4
On a NEMA CMU program card, how does the signal tech program allowable phases?
Correct Answer
Install copper jumpers and soldering them on the program card
Question 5
According to best maintenance practices, how often should CMU/MMU be tested?
Correct Answer
Annually
Question 6
The MMU indicates a RED-FAIL fault on phase 6. Why?
Correct Answer
The load switch/switch pack produces no outputs.
Question 7
The purpose of the controller CVM (Controller Voltage Monitor) output is to allow the CMU/MMU to monitor the
Correct Answer
Controller health
Question 8
When a Technician is recertifying the CMU/MMU at an intersection, what should the technician do to have the intersection exit flash?
Correct Answer
Replace the CMU/MMU with a newly tested unit
Question 9
Absence of all colors on a load switch will be indicated by what fault on an MMU or MMU2?
Correct Answer
Red Fail
Question 15
An older TS1 cabinet experiences a flash condition but the signal heads are also showing active green, yellow, and red indications. What is the MOST COMMON issue?
Correct Answer
The mercury contactor is stuck in the normal position.
Question 16
In a Dual-Ring, 8-phase traffic signal controller, how many phases can run in each ring at the same time?
Correct Answer
1
Question 17
Observations indicate that vehicles are being detected in one lane and that this is shown on the detection interface unit. However, the controller does not show any detection for that phase. This could be caused by
Correct Answer
Improper detection phase assignment programming in the controller
Question 18
As soon as vehicles leave the detection zone of an approach that has met its minimum green time, a signal immediately goes to yellow from the green display. This could be a result of
Correct Answer
no extension time programmed.
Question 19
What is one reason the phase interval may change even though there is still vehicle demand?
Correct Answer
maximum green time has been met
Question 20
A signal tech is reviewing the controller logs and continually sees a cycle fault error. What does that mean?
Correct Answer
The CU has not serviced a call in two cycles while in free mode.
Question 21
A coordinated corridor is working well except at one intersection where a platoon of vehicles is being stopped. The MOST LIKELY problem is the
Correct Answer
clock has drifted affecting the offset and needs adjusting
Question 22
Observations indicate that right turning vehicles approach the intersection on the side street, stop and then make a right turn on red. When this happens the signals cycle to the side street even though there are no longer vehicles present in the detection zone. This could be caused by
Correct Answer
the detection being set to locking detection
Question 23
Of the following, which answer MOST LIKELY would require a controller database be verified to be correct?
Correct Answer
When a controller upgrade has been performed
Question 24
Which offset mode is the easiest way to view progression in a coordinated corridor?
Correct Answer
Beginning of green
Question 29
An intersection goes into flash every morning at exactly the same time. Which of the following is the LEAST IMPORTANT piece of data that can be retrieved from the cabinet?
Correct Answer
Controller Voltage
Question 30
If a Signal Tech is required to change a timing parameter in the controller, it is MOST IMPORTANT to do which of the following?
Correct Answer
Alert their supervisor of the changes made
Question 31
A signal tech sees that the detection is working properly at the detection device, and is connected to the controller but the controller does not get the input. What could be one of the issues preventing the detection from getting to the controller?
Correct Answer
The detector is not mapped in the controller correctly.
Question 32
Which reference contains the calculation of pedestrian timing?
Correct Answer
MUTCD 2009
Question 33
What is the basic standard a timing engineer uses to calculate the pedestrian clearance times?
Correct Answer
Pedestrian clearance time is computed as the crossing distance divided by the walking speed.
Question 34
When installing an APS detector (Accessible Pedestrian Signal) unit, at which distance does the MUTCD require the audible sound to be heard from the push button?
Correct Answer
Pushbutton locator tones shall be intensity responsive to ambient sound, and be audible 2 to 6 feet from the button, or the building line, whichever is less.
Question 35
What is the BEST way to verify that the proper PED actuation corresponds to the proper phase?
Correct Answer
One technician pushes individual buttons while another technician verifies inputs in the controller are correct.
Question 36
When testing a countdown pedestrian head, how does an IMSA traffic signal field tech II determine the correct time that should be displayed in the countdown?
Correct Answer
The previous pedestrian clearance time is recorded in the pedestrian head and used for the next cycle.
Question 37
What is the MINIMUM pedestrian clearance time for a crosswalk that is 80 feet ( meters)?
Correct Answer
23 seconds
Question 38
When checking the pedestrian timing in the controller, what is the proper amount of time that should be given to a pedestrian signal?
Correct Answer
The clearance time is equal to the width of the intersection divided by 3.5ft/second
Question 44
What equipment is NOT used in troubleshooting a video detection system?
Correct Answer
lightmeter
Question 45
What happens when a vehicle parks in a detector zone at an intersection using non- intrusive detection?
Correct Answer
The detection system learns to remove the effect of the parked vehicle.
Question 46
Two adjacent lanes each have loop detectors which are connected to one channel of detection. Observations indicate that vehicles are not being detected in one lane. This could be caused by
Correct Answer
a damaged loop connected in parallel.
Question 47
Which of the following terms is used to describe when two loop fields interact with each other in an adverse way?
Correct Answer
Cross-talking
Question 48
Adding turns to a loop
Correct Answer
Increases the inductance
Question 49
Which detection systems typically cannot be used for pedestrian detection?
Correct Answer
Loops
Question 50
What is the BEST way to determine if a loop wire's insulation has failed?
Correct Answer
Visual Inspection
Question 51
When installing a ground rod it MUST BE installed so that the Technician can obtain an ohm reading of
Correct Answer
25 ohm or less.
Question 52
Logic ground should be
Correct Answer
Isolated from cabinet.
Question 53
What is one of the QUICKEST ways to determine if a piece of electrical equipment has been burnt by a short or high voltage?
Correct Answer
there will be an odor that can be detected
Question 59
While in the field, where would an Tech find information about work that has been performed at a traffic signal intersection?
Correct Answer
The cabinet log book, located inside traffic signal cabinet.
Question 60
The cabinet has been modified and new detection is added. Where is the MOST appropriate place to note the additions?
Correct Answer
Add details to the log book noting all the changes
Question 61
Which of the following documents should a technician check when performing controller troubleshooting?
Correct Answer
Maintenance logs/intersection drawings/timing charts
Question 62
What is the standard used to define how traffic signal controllers and networks communicate?
Correct Answer
National Transportation Communications for Intelligent Transportation systems (ITS) protocol (NTCIP).
Question 63
The traffic management center notifies a field tech that the communications to maple st. And 1st street cuts in and out. The tech arrives at the intersection finding the modem is overheating and indicator lights are blank. After about twenty minutes of checking cables, the tech notices the modem is active again and cool to the touch. The TMC confirms communications are restored. The tech Checks the log book and finds this problem is a recuring issue. what should the tech do?
Correct Answer
Replace the modem
Question 64
A managed network switch is being used in the cabinet. What is needed in the IP programming of the controller to get through the switch and to the TOC?
Correct Answer
Gateway
Question 65
The pedestrian assembly (pedestrian 6) on the SW corner was damaged in a traffic accident and the tech cannot repair until the following day. What should the Tech do until they return to replace the pedestrian assembly?
Correct Answer
Make wiring safe. Bag opposite signal display pedestrian phase (6). Document in cabinet log book and work order system. Notify supervisor that they need a pedestrian display assembly and to schedule the installation.
Question 66
After doing any repairs at a traffic signal which of the following is the MOST IMPORTANT to do before leaving the intersection?
Correct Answer
Observe signal is operating per plans.
Question 72
The technician arrives at an intersection where all the signals are out. What does the technician do FIRST?
Correct Answer
check the line service to make sure there is main power.
Question 73
The technician arrives at an intersection that is dark. What type of meter does the technician use the check voltage?
Correct Answer
Multimeter
Question 74
A technician received a call that a signal head was knocked down. The technician arrives on scene, repairs the problem, observes the intersection is functioning properly and completes his job duties. What is the technician's LAST task before leaving the intersection?
Correct Answer
Document all repairs and the incident in the maintenance logs.
Question 75
A technician observes two different colored signals displayed at the same time in one direction. The Tech knows the problem is LEAST LIKELY related to the
Correct Answer
incoming power
Question 76
A technician arrives at the intersection and the light is on flash. What should the technician do?
Correct Answer
Check the conflict monitor display and then reset it.
Question 77
The MOST IMPORTANT thing to do when completing work is to
Correct Answer
document all changes in the maintenance logs.
Question 78
Faulty components should be
Correct Answer
labelled and marked for repair or disposal.
Question 79
What is required where wires enter the traffic fixtures and/or poles to eliminate wire chaffing?
Correct Answer
Grommets
Question 80
All wiring not being used should be
Correct Answer
attached to ground bar
Question 81
What type of connectors should the tech use when repairing wires underground or in a manhole?
Correct Answer
Waterproof
Question 87
During scheduled preventative maintenance the Tech observes that the catenary wire is cut next to a street sign on a span wire. What should the tech do?
Correct Answer
Install a Strandvice inline of catenary wire, and make a note in the work order for management to schedule replacement of catenary wire.
Question 88
After a trouble call, the tech observes that the catenary 9/16" strandvise at the concrete pole is broken. What should the tech do?
Correct Answer
Using a come along, loosen the 9/16" wire then remove the broken 9/16" strandvise. Install the new 9/16" strandvise onto the eyebolt on the pole than pull the 9/16" catenary steel wire through the strandvise and release the tension on the come along slowly.
Question 89
When replacing a signal head, what is NOT important?
Correct Answer
Manufacturer of signal.
Question 90
How does the technician know that signal poles are installed in the correct locations?
Correct Answer
Check the intersection schematics/drawings.
Question 91
Glancing at the cabinet wiring schematic, how can a technician know they are working in a NEMA TS-1 8 phase cabinet?
Correct Answer
Controller is connected to cabinet wiring using 3-4 multiwire connectors.
Question 92
What is the BEST test instrument to assist the Tech for locating bad fiber optic splices or cut fiber optic cables in the field?
Correct Answer
Optical Time Domain Reflectometer (OTDR)
Question 93
What testing device would a tech use to verify continuity of a detector home run cable?
Correct Answer
Multimeter.
Question 94
What is a way to verify the UPS has been connected and is operating properly?
Correct Answer
Turn off the main breaker at the electric service disconnect.
Question 95
During inspection of the UPS connected at the traffic signal, the tech notices one of four batteries has expanded and bubbled. What is the recommended response?
Correct Answer
Test other batteries, and replace the expanded bubbled battery along with other failing batteries.
Question 96
Which of the following MUST be done after changing the UPS batteries?
Correct Answer
Document initial battery voltages and work done in the traffic signal cabinet log book.
